Parent Layer: Kamas OFR-763

Name: ContactsAndFaults

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Description: The Kamas 7.5’ quadrangle is in the Wasatch Back and is centered over the north-south-trending Kamas Valley with foothills of the Uinta Mountains to the east and the Keetley volcanic field in the West Hills to the west. The Weber River, a major source of drinking water, flows west out of the mouth of Weber Canyon in the northeast corner of the map area. The Kamas quadrangle encompasses the cities of Kamas and Oakley, as well as the town of Peoa. The Kamas quadrangle is located at the intersection of several major tectonic elements. The Uinta anticline formed during the Laramide orogeny (Late Cretaceous to Eocene) as a major, doubly plunging, east-west basement-cored anticlinal arch and plunges west beneath Kamas Valley. Paleozoic strata broadly dip southwest to northwest, defining the western plunge throughout the map area. The Frog Valley thrust fault present in the north part of the map is interpreted as thin-skinned deformation related to the Jurassic to Cretaceous Sevier fold and thrust belt. This fault was subsequently rotated northwest and steepened by a buried strand of the North Flank fault of the Laramide Uinta Mountain Uplift. The steepened thrust fault continues west beyond the map area and connects to a larger system of thrust faults including the Crandall Canyon, Absaroka, and the North Flank faults. Paleogene volcanic rocks overlie older rocks and preexisting structures throughout the Kamas quadrangle. During the Paleogene, intermediate dikes and shallow intrusions fed stratovolcanoes which erupted the Keetley Volcanics. Lava flows, volcaniclastic deposits, and ash-fall deposits blanketed a large swath of the map area with significant thickness variations due to paleotopography and potential active normal faulting at the time of deposition. An eroded volcanic stock (Indian Hollow) with a radial dike swarm that sourced the extrusive volcanics is present in the southwestern part of the map area.The East Kamas Valley fault forms a half graben system that bounds the eastern margin of Kamas Valley. Although concealed by Quaternary alluvial, fluvial, and mass movement deposits, its presence is apparent from gravity, well, and geomorphic data. There are five main types of unconsolidated Quaternary deposits in the map area: landslide deposits, colluvium, alluvium, alluvial-fan deposits, and glacial outwash deposits.

Copyright Text: Program Manager: Stefan M. Kirby Project Manager: Zachary W. Anderson GIS and Cartography: Keilee A. Higgs Geology Review: Zachary W. Anderson GIS and Cartography Review: Austin J. Jensen and Subigya Shah Funding: Funded by the Utah Geological Survey and the U.S. Geological Survey, National Cooperative Geologic Mapping Program, through USGS STATEMAP award number G22AC00383 (2022–2024).

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